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Hello all, I went to the service center & they told me that it was the exaust sensor & when i told them that I tried to change it but still the consumption was bad they found that even the new exaust sensor had something wrong so they changed it again & now the consumption is the half
thanks all

I have an automatic lanos 2000, it consumes very much fuel, & sometimes the acceleration is too bad -but not all the time-
I tried to chane the oxygen sensor (exaust sensor) but nothing changed
what can it be?
thanks